Compilare: user.cpp: In function ‘int main()’: user.cpp:28:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ user.cpp:31:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&a[i][j]); ^ user.cpp:68:13: warning: ‘is’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (l=ii;l<=is;l++){ ^ user.cpp:27:23: warning: ‘ii’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,i,j,ic,jc,ii,js,is,maxi=0,st,ok,jj,l,c; ^